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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3848eacc5d50128dc931a94e23e031ee75d8d122e5cfc0113f5333797e029f93' 
  AND token = 'wvDYH7SDorZylqgSKpjpilJusi7KSfJZxo79oziDy14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}